Effect of Nb on oxidation behavior of high Nb containing TiAl alloys

被引：234
|
作者：
Lin, J. P. [1 ]
Zhao, L. L. [1 ]
Li, G. Y. [1 ]
Zhang, L. Q. [1 ]
Song, X. P. [1 ]
Ye, F. [1 ]
Chen, G. L. [1 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
来源：
INTERMETALLICS | 2011年 / 19卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Titanium aluminides; based on TiAl; Microalloying; Oxidation; HIGH-TEMPERATURE OXIDATION; INITIAL-STAGES;
D O I：
10.1016/j.intermet.2010.08.029
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The isothermal oxidation behavior of Ti-45Al-8Nb and Ti-52Al-8Nb alloys at 900 degrees C in air was investigated. The early oxidation behaviors were studied by using XPS and AES. And the microstructure and the composition of the oxidation scale were studied by using XRD and SEM. The results show that the oxidation behavior of TiAl alloy is significantly improved by Nb addition. Nb substitutes for Ti in TiO2 as a cation with valence 5, and thus to suppress TiO2 growth. The (Ti,Nb)O-2-rich layer is a dense and chemically uniform which is more protective than the TiO2 layer. Nb addition also lowers the critical Al content to form an external alumina. Nb2Al phase is formed in the metallic matrix at the oxide metal interface on the high Nb containing TiAl alloys. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：131 / 136
页数：6
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